Simulation of Unsteady, Three-Dimensional, Viscous Flows Using a Dual- Time Stepping Method

摘要: A time-accurate flow solver for the three-dimensional Reynolds-averaged Navier-Stokes equations has been developed. An implicit time discretization is used, and resulting set of coupled non-linear solved iteratively. This accomplished using well proven convergence acceleration techniques explicit schemes such as multigrid, residual averaging, local stepping, in order to achieve large computational efficiency calculation. The approach, known dual-time stepping literature, allows physical step be chosen on basis accuracy rather than stability. method parallelized domain decomposition technique. Results are presented transonic flows around oscillating LANN-wing. speed-up made possible through parallelization pointed out. Using Baldwin-Lomax turbulence model, good agreement pressure coefficient with experimental data shown attached flows. shock induced separation LANN-CT9 test case predicted too far downstream.